煤矿安全2019，Vol.50Issue(12)：219-222,4.DOI:10.13347/j.cnki.mkaq.2019.12.048
软岩边坡陡帮开采破坏机理及数值研究
Study on Failure Mechanism and Numerical Simulation of Steep Slope Mining in Soft Rock Slope
闫杰 1霍中刚2
作者信息
- 1. 煤炭科学研究总院,北京 100013
- 2. 煤炭科学技术研究院有限公司 安全分院,北京 100013
- 折叠
摘要
Abstract
Slope angle of open pit mining is an important indicator of resource recovery rate, and steep slope mining can improve the mining slope angle, but it will aggravate the slope deformation, so it is necessary to control stress release and displacement deformation in steep slope mining. The relationship between in-situ stress and strength of soft rock is studied by Mohr-Coulomb criterion, and the criterion of stress redistribution and stress release is determined. The slope model of typical soft rock mine, the condition of groundwater and the mechanical index of rock and soil are selected. Through research, it is determined that the sliding mode of slope is "sitting-sliding"and slides along weak mudstone stratum. Before steep slope mining, the sliding stability of the slope along the roof and floor of the coal seam is 1.142 and 1.150, and the stability under the control of the floor is greater than that under the control of the roof. After steep slope mining, a large displacement and plastic deformation area is formed on the bench below 558 level, which is in the limit equilibrium state. The overall sliding stability along the coal seam floor is 1.033, which is consistent with the displacement failure mode of steep mining in numerical simulation.关键词
软岩边坡/陡帮开采/破坏模式/边坡稳定性/应力释放 Key words: soft rock slope/ steep slope mining/ failure mode/ slope stability/ stress release分类
矿业与冶金引用本文复制引用
闫杰,霍中刚..软岩边坡陡帮开采破坏机理及数值研究[J].煤矿安全,2019,50(12):219-222,4.
